hdkbill - thanks for responding, but i don't see how signing a form will make a person 18. if they are in this industry, they are already willing to break laws, so i'm sure they'll have no problem signing a form.

unless you have webmasters send you their drivers license (which i'm sure most people won't be comfortable with), it seems like a form like the one on http://www.myfirstsexteacher.com/ref/4//warning.html will have the same function since online sigs are legal.